Look for config file in stabdard location on startup

kitty/config.py

@@ -5,6 +5,8 @@
 import re
 from collections import namedtuple
 
+from PyQt5.QtGui import QFont, QFontInfo
+
 key_pat = re.compile(r'([a-zA-Z][a-zA-Z0-9_-]*)\s+(.+)$')
 
 defaults = {}
@@ -15,6 +17,8 @@ foreground       #dddddd
 foreground_bold  #ffffff
 cursor           #dddddd
 background       #000000
+font_family      monospace
+font_size        system
 
 # black
 color0   #000000
@@ -63,7 +67,11 @@ def load_config(path):
     if not path:
         return defaults
     ans = defaults._asdict()
-    with open(path) as f:
+    try:
+        f = open(path)
+    except FileNotFoundError:
+        return defaults
+    with f:
         for line in f:
             line = line.strip()
             if not line or line.startswith('#'):
@@ -74,3 +82,8 @@ def load_config(path):
                 if key in ans:
                     ans[key] = val
     return Options(**ans)
+
+
+def validate_font(opts):
+    if not QFontInfo(QFont(opts.font_family)).fixedPitch():
+        raise ValueError('The font specified in the configuration "{}" is not a monospace font'.format(opts.font_family))

kitty/constants.py

@@ -2,6 +2,28 @@
 # vim:fileencoding=utf-8
 # License: GPL v3 Copyright: 2016, Kovid Goyal <kovid at kovidgoyal.net>
 
+import os
+from PyQt5.QtCore import QStandardPaths
+
 appname = 'kitty'
 version = (0, 1, 0)
 str_version = '.'.join(map(str, version))
+
+
+def _get_config_dir():
+    # This must be called before calling setApplicationName
+    if 'KITTY_CONFIG_DIRECTORY' in os.environ:
+        return os.path.abspath(os.path.expanduser(os.environ['VISE_CONFIG_DIRECTORY']))
+
+    candidate = QStandardPaths.writableLocation(QStandardPaths.ConfigLocation)
+    if not candidate:
+        raise RuntimeError(
+            'Failed to find path for application config directory')
+    ans = os.path.join(candidate, appname)
+    try:
+        os.makedirs(ans)
+    except FileExistsError:
+        pass
+    return ans
+config_dir = _get_config_dir()
+del _get_config_dir

kitty/main.py

@@ -13,7 +13,7 @@ from PyQt5.QtCore import Qt, QSocketNotifier
 from PyQt5.QtWidgets import QApplication, QMainWindow, QMessageBox
 
 from .config import load_config, validate_font
-from .constants import appname, str_version
+from .constants import appname, str_version, config_dir
 from .term import TerminalWidget
 
 
@@ -67,7 +67,7 @@ def option_parser():
     a = parser.add_argument
     a('--name', default=appname, help=_('Set the name part of the WM_CLASS property'))
     a('--class', default=appname, dest='cls', help=_('Set the class part of the WM_CLASS property'))
-    a('--config', default=None, help=_('Specify a path to the config file to use'))
+    a('--config', default=os.path.join(config_dir, 'kitty.conf'), help=_('Specify a path to the config file to use'))
     a('--cmd', '-c', default=None, help=_('Run python code in the kitty context'))
     a('-d', '--directory', default='.', help=_('Change to the specified directory when launching'))
     a('--version', action='version', version='{} {} by Kovid Goyal'.format(appname, '.'.join(str_version)))